"I just found out," Miller told the BBC. "It's the most exciting news in the world."

In Nottingham, the usually villainous sheriff will be portrayed as heroic, while Robin Hood â€" traditionally known for nobly stealing from the rich to give to the poor, of course â€" is the antagonist.

As for her role â€" in the past, Robin always had a thing for Marian â€" Miller said she "could not have a better part," while teaming with Crowe and Scott is "as good as it gets."

FREE Movie Newsletter

Although born in New York City, Sienna Miller was raised in London. Miller initially started her career as a model, modeling for such big names as Coca-Cola, Vogue, and Prada. Miller's big breakthrough perforamnce as an actress was in the 2004 Alfie starring Jude Law. Since then, Miller has had a nice filmography including Casanova, Factory Girl, and Stardust. Miller is also currently set to be in several movies in 2008 and 2009, including the highly anticipated G.I. Joe movie.